Combustion chambers for domestic heating boilers



T. M. BUNTEN Oct. 28, 1969 Filed March 4, 1968 a 3 m E g Pb 5 r l rr H/ a 3 0 .2 x lr 7 a k. 1 l| n w am. m e w V M w m W THEODORE M. EUNTEN ATTORNEY Patented Oct. 28, 1969 3,474,765 COMBUSTION CHAMBERS FOR DOMESTIC HEATING BOILERS Theodore M. Bunten, Rydal, Pa., assignor to Repco Products Corporation, Philadelphia, Pa., a corporation of Pennsylvania Filed Mar. 4, 1968, Ser. No. 710,041 Int. Cl. F22b 37/24 US. Cl. 122510 Claims ABSTRACT OF THE DISCLOSURE A combustion chamber for domestic heating boilers, light in weight and formed of bonded refractory fibers, the combustion chamber having a supporting flange additionally providing a gasket seal at its upper outer margin between the fire box shell and the boiler.

BACKGROUND OF THE INVENTION Field of the invention This invention relates to combustion chambers for domestic heating boilers and more particularly to combustion chambers inserted in the firebox of the boiler.

Description of the prior art appliances but the use of these in domestic heating boil-.

ers has not heretofore been satisfactorily accomplished.

SUMMARY OF THE INVENTION In accordance with the invention a combustion chamber is provided for an upright domestic heating boiler, the combustion chamber being light in weight and free from brittleness, and being suspended in and supported by the firebox shell at the top thereof and providing a gasket seal between the firebox shell and the boiler tube sheet located thereabove.

It is the principal object of the present invention to provide a simple but effective combustion chamber for domestic heating boilers which is light in weight, quick and easy to install, which does not require any high degree of skill for installation, and which will provide an effective seal with the boiler section thereabove.

It is a further object of the present invention to provide a combustion chamber for domestic heating boilers which is preformed to the desired shape for pendant installation in the firebox shell and for connection to the burner tube support and to the access opening tube, the chamber when installed being in pendant supported condition and providing an effective seal between the firebox shell and a superposed boiler section.

Other objects and advantageous features of the invention will be apparent from the description and claims.

BRIEF DESCRIPTION OF THE DRAWINGS The nature and characteristic features of the invention will be more readily understood from the following description taken in connection with the accompanying drawings forming part thereof, in which:

FIGURE 1 is a vertical central sectional view of a domestic heating boiler having a combustion chamber in accordance with the invention mounted therein;

FIG. 2 is an exploded perspective view illustrating the manner of assembly of the combustion chamber and firebox shell; and

FIG. 3 is a bottom plan view of the combustion chamher.

It should, of course, be understood that the description and drawings herein are illustrative merely, and that various modifications and changes can be made in the structure disclosed without departing from the spirit of the invention.

Like numerals refer to like parts throughout the several views.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now more particularly to the drawings, a domestic heating boiler 10 is shown generally and has a base 11, and a hollow cylindrical steel firebox shell 12 carried on the base 11 with an interiorly disposed combustion chamber 14 to be described.

The firebox shell 12 preferably has secured thereto, such as by welding, a horizontal burner tube 15 with a flange 16 for attachment of a burner unit (not shown) of conventional type. The shell 12 also has secured thereto, such as by welding, a horizontal access or viewing opening tube 17.

The firebox shell 12, in order to accommodate and support and retain the combustion chamber 14, is provided at its upperextremity with an outwardly flared rim 18, and a plurality of mounting clips 19 spaced around the exterior of the shell 12 below the rim 18. The clips 19 are preferably welded in place and extend outwardly beyond the rim 18.

The combustion chamber 14 preferably has a frustoconical side wall 20, a bottom wall 21, and a top outwardly extending mounting and supporting flange 22. The bottom wall 21 may be flat or may have a central depressed portion 23 to aid in locating the combustion chamber 14 upon assembly into the shell 12.

The combustion chamber 14 preferably has a lower hollow boss 25 within which the burner tube 15 extends and an upper hollow access opening boss 26 on the exterior of which the access opening tube 17 is disposed.

The combustion chamber 14 preferably is also provided immediately below the flange 22 with a plurality of integral positioning lugs 27, the exterior positioning faces 28 of which engage the inner face of the shell 12 and center the rim 18. The interiors of the lugs 27 are relieved for clearance as at 29, to permit downward movement of a cleaning brush .(not shown) and removal of soot from above without injury to the combustion chamber 14.

The combustion chamber 14 is preferably molded in a single piece, of a fibrous refractory material, such as asbestos, with an inorganic temperature stable ceramic binder of any desired type, of a thickness in the range of about three-eighths of an inch up to about five-eighths of an inch and is preferably of a density of 9 or 10 pounds per cubic foot.

Such material has some degree of compressibility and resilience, has a temperature limit of the order of 2300 F., can be saturated with oil or water and then fired without damage, and is not injured by direct flame and oil impingement thereon. Such a material, available under the name of J-M Cera Form from Johns-Manville, New York, N.Y., has improved operating and combustion efficiency, heats up very rapidly, develops higher temperature combustion, and thus reduces the tendency to soot and smoke formation. The light weight characteristic as well as the fibrous nature of the combustion chamber 14 constructed of such material also tends to reduce noise and to muflie oil burner turbulence. The light weight characteristics also facilitate shipping and installation.

The resiliency and compressibility also permits of surface conformation and sealing engagement with rim 18.

The main boiler section 30, which is superposed on the shell 12, has a bottom tube sheet 31 with an outwardly extending rim portion 32 and a plurality of vertical fire tubes 33. The number of tubes 33 is determined by the heat absorbing capacity of the boiler section 30.

The main boiler section 30, when in position engages the upper face of the mounting flange 22. The lower face of the mounting flange 22 engages the rim 18 of the firebox shell 12.

A plurality of bolts 35 extending through openings 36 in the rim 32 and through openings 37 in the clips 19 and held by nuts 38, retain the combustion chamber 14 in place and retain the boiler section 30 and combustion chamber 14 in assembled relation to firebox shell 12 with the mounting flange 22 interposed between and engaged by the rim 32 and the rim 31.

The pressure applied on the mounting flange 22 is determined by the weight of the main boiler section 30 and the parts carried thereon. In order to prevent excessive pressure which might unduly compress the flange 32, spacer sleeves 39 are preferably interposed on the bolts 35 between the rims 32 and the clips 19. The spacer sleeves 39 are of a length slightly less than the thickness of the flange 22 to permit of compression without crushing of the mounting flange 22 and so that in addition to supporting the combustion chamber 14 the flange 22 provides a gasket seal.

The mode of use will be apparent from the foregoing.

It may be noted that the firebox shell 12 is placed on the base 11 and the combustion chamber 14 is inserted with the burner tube being inserted within the boss 25 where it has a snug fit and the access opening tube 17 being disposed on the exterior of the boss 26, also with a snug fit. The faces 28 of the lugs 27 aid in centering the top of the combustion chamber 14 with its mounting flange 22 on the rim 18.

The boiler section 30 can then be put in place.

The spacer sleeves 39 are positioned on the clips 19 beneath the rim 32 and the attachment is completed by inserting the bolts 35 and applying and tightening the nuts 38 until the spacer sleeves 39 are tightened between the tube sheet rim 32 and the clips 19.

When the boiler is to be cleaned the interior spaces 29 of the lugs 27 provide clearance spaces and reduce the likelihood of injury upon downward movement of cleaning brushes or other tools (not shown) in the outer of the tubes 33.

It will thus be seen that a combustion chamber has been provided which attains the objects of the invention.

I claim:

1. A boiler having a firebox shell and a boiler section superposed thereon, the improvement thereof comprising said firebox shell having an outwardly extending rim,

said boiler section having an outwardly extending rim above said firebox shell rim, and

a combustion chamber having an integral mounting flange extending from the upper portion thereof, said flange being of compressible material interposed between and directly engaged by said rims in gasketin-g relation thereto.

2. A boiler having a firebox shell and a boiler section superposed thereon, the improvement thereof comprising said firebox shell having an outwardly extending rim,

said boiler section having an outwardly extending rim above said firebox shell rim, and

a combustion chamber having a compressible mounting flange interposed between and engaged by said rims,

said shell having holding members thereon, and

fastening members engaging said holding members and said boiler section rim,

said fastening members having spacers thereon for determining the compression of said flange.

3. A boiler having a firebox shell and a boiler section superposed thereon, the improvement thereof comprising said firebox shell having an outwardly extending rim,

said boiler section having an outwardly extending rim above said firebox shell rim,

a combustion chamber with a compressible mounting flange interposed between and engaged by said rims, and

members for holding said rims in predetermined spaced relation and thereby determining the compression of said flange.

4. A boiler having a firebox shell and a boiler section superposed thereon, the improvement thereof comprising said firebox shell having an outwardly extending rim,

said boiler section having an outwardly extending rim above said firebox shell rim, and

a combustion chamber having a compressible mounting flange interposed between and engaged by said rims,

said combustion chamber comprising bonded refractory fibers.

5. A boiler having a firebox shell and a boiler section superposed thereon, the improvement thereof comprising said firebox shell having an outwardly extending rim,

said boiler section having an outwardly extending rim above said firebox shell rim, and

a combustion chamber having a compressible mounting flange interposed between and engaged by said rims,

said combustion chamber having a side wall with said flange extending outwardly from the upper extremity thereof, and

said side wall being closed by an integral bottom wall.

References Cited UNITED STATES PATENTS 2,186,803 1/1940 Georg l22l56 2,197,612 4/1940 Georg 1225l0 2,576,988 12/1951 Arant 122-510 XR 3,151,614 10/1964 Mendelson 122494 XR KENNETH W. SPRAGUE, Primary Examiner @3 3 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent 3474 75; Dated October 28, 1969 Inventor(s) Theodore M. Bunten It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

In the heading of the patent "5 claims should read 6 claims Claim 6 should have been included and reads as follows:

6 A boiler as defined in claim 5 in which said bottom wall has a downwardly projecting positioning portion.

SIGNED AND SEALED JAN 201970 Anew Edward Fletcher. I WILLIAM E sown-m a l! 0 y 0 At kofficer finissioner at Patents 

